Integrating CakePHP with vBulletin
 

I'm trying to integrate vBulletin with a CakePHP application. The requirement is that when a user clicks the 'Forum' link within the Cake app, he should be redirected to the vBulletin index page and be automatically logged in.

At the point of click, I will have the user's vBulletin username and password. Could anyone advise the code necessary to perform an automatic sign-in into vBulletin given these two credentials?

I have tried the following code (derived from login.php) but it fails miserably and I have no idea what is going wrong:

<?php
// called from inside a CakePHP controller
function login($vb_name, $vb_pass) {

define('CWD', $this->optForumDir); // this is the disk path to vB

define('THIS_SCRIPT', 'login');

$_REQUEST['do'] = 'login';

require_once(CWD . "global.php");
require_once(CWD . "includes/functions_login.php");

$vbulletin->userinfo = $vbulletin->db->query_first("SELECT userid, usergroupid, membergroupids, infractiongroupids, username, password, salt FROM " . TABLE_PREFIX . "user WHERE username = '" . $vbulletin->db->escape_string(htmlspecialchars_uni($vb_name)) . "'");

process_new_login('',0,'');
do_login_redirect();
}
?>

Any help much appreciated.

Vikram